SEAT LUMBAR ADJUSTMENT DEVICE

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The application claims priority to Chinese patent application No. 2024221303446, filed on Aug. 30, 2024, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the technical field of seats, and in particular, to a seat lumbar adjustment device.

BACKGROUND

A seat is a sitting device with a backrest and sometimes armrests. In ancient times, people sat on the ground, and originally there were no chair. The Chinese character “”, which means “chair”, was originally the name of a kind of tree in ancient China.

When seated, users often press their lower back against the seat to relieve lumbar fatigue. However, when users adjust their sitting posture, it is difficult for the lower back to maintain consistent contact with the seat, reducing user comfort. Therefore, enabling the seat to adapt to posture changes while ensuring continuous lumbar support can enhance user comfort.

SUMMARY

In view of the shortcomings in the existing technologies, the present disclosure provides a seat lumbar adjustment device, which solves the technical problem that some existing seats cannot consistently conform to the user's lower back, reducing user comfort.

The above technical objective of the present disclosure is achieved through the following technical solution.

A seat lumbar adjustment device includes:

• • a first force-bearing plate;
  • two first force-bearing rods, one end of each of the two first force-bearing rods being hinged to the first force-bearing plate;
  • a second force-bearing plate, wherein the second force-bearing plate is opposite the first force-bearing plate, and the other end of each of the two first force-bearing rods are slidably and rotatably connected to the second force-bearing plate;
  • two second force-bearing rods, wherein one end of each of the two second force-bearing rods is hinged to the second force-bearing plate, and the other end of each of the two second force-bearing rods is slidably and rotatably connected to the first force-bearing plate;
  • two first force-bearing blocks, which are correspondingly and rotatably provided at the ends of the two first force-bearing rods close to the first force-bearing plate;
  • a first connecting shaft, which is rotatably provided between the two first force-bearing blocks and is rotatably connected to the ends of the two second force-bearing rods close to the first force-bearing plate;
  • a second force-bearing block, which is fixedly provided at one end of the first force-bearing plate;
  • a gas strut, one end of the gas strut being rotatably connected to the first connecting shaft, and the other end of the gas strut being fixedly connected to the second force-bearing block; and
  • a sixth connecting shaft, which is rotatably connected to the first force-bearing rod and the second force-bearing rod on the same side.

The working principle is as follows.

The adjustment device is fixed in a certain position, so that one end of the first force-bearing plate is fixed to the backrest of a seat, and one end of the second force-bearing plate is fixed to a lumbar support block. When it is necessary to adjust the lumbar support block to enable the lumbar support block to conform to a user's lower back, the gas strut is activated. The length of the gas strut can be adjusted to push the lumbar support block to move. The lumbar support block drives the second force-bearing plate to move toward the first force-bearing plate. The second force-bearing plate drives the second force-bearing rods and the first force-bearing rods to rotate around the sixth connecting shaft. The ends of the second force-bearing rods close to the first force-bearing plate slide and rotate, while the ends of the first force-bearing rods close to the second force-bearing plate slide and rotate.

When it is necessary to move the first force-bearing plate and the second force-bearing plate away from each other, the gas strut is activated. The gas strut extends and drives the first connecting shaft to move. The first connecting shaft drives the ends of the second force-bearing rods close to the first force-bearing plate to move. Meanwhile, under the pushing force of the gas strut, the second force-bearing rods rotate around the sixth connecting shaft. The rotation of the second force-bearing rods drive the second force-bearing plate to slide away from the first force-bearing plate. The movement of the second force-bearing plate drives the first force-bearing rods to rotate around the sixth connecting shaft, while the ends of the first force-bearing rods close to the second force-bearing plate slide.

Compared with the existing technologies, the present disclosure has the following beneficial effects.

The adjustment device is fixed in a certain position, so that one end of the first force-bearing plate is fixed to the backrest of a seat, and one end of the second force-bearing plate is fixed to a lumbar support block. When it is necessary to adjust the lumbar support block to enable the lumbar support block to conform to a user's lower back, the gas strut is activated. The length of the gas strut can be adjusted to push the lumbar support block to move. The lumbar support block drives the second force-bearing plate to move toward the first force-bearing plate. The second force-bearing plate drives the second force-bearing rods and the first force-bearing rods to rotate around the sixth connecting shaft. The ends of the second force-bearing rods close to the first force-bearing plate slide and rotate, while the ends of the first force-bearing rods close to the second force-bearing plate slide and rotate.

When it is necessary to move the first force-bearing plate and the second force-bearing plate away from each other, the gas strut is activated. The gas strut extends and drives the first connecting shaft to move. The first connecting shaft drives the ends of the second force-bearing rods close to the first force-bearing plate to move. Meanwhile, under the pushing force of the gas strut, the second force-bearing rods rotate around the sixth connecting shaft. The rotation of the second force-bearing rods drive the second force-bearing plate to slide away from the first force-bearing plate. The movement of the second force-bearing plate drives the first force-bearing rods to rotate around the sixth connecting shaft, while the ends of the first force-bearing rods close to the second force-bearing plate slide.

By means of the driving of the gas strut, the first force-bearing rods and the second force-bearing rods cooperate with each other, thereby driving the first force-bearing plate and the second force-bearing plate to move toward or away from each other. This in turn drives the lumbar support block to move, thereby ensuring the lumbar support block conforms to a user's lower back.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic cross-sectional structural diagram according to an embodiment of the present disclosure;

FIG. 2 is an enlarged schematic view of part A in FIG. 1;

FIG. 3 is a schematic cross-sectional structural diagram of a sixth force-bearing block of an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a first force-bearing plate from another perspective according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a working state of a transmission block according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another working state of the transmission block according to an embodiment of the present disclosure; and

FIG. 7 is a schematic diagram of an installation structure according to an embodiment of the present disclosure.

Description of Reference signs: 10—Force-bearing spring; 11—Seventh force-bearing block; 12—Fourth connecting shaft; 13—First force-bearing plate; 14—Sixth connecting shaft; 15—Second force-bearing rod; 16—Third force-bearing block; 17—Second connecting shaft; 18—Second force-bearing plate; 19—Fifth connecting shaft; 20—Fourth force-bearing block; 21—Third limiting slot; 22—First force-bearing rod; 23—Connecting plate; 24—Gas strut; 25—Fifth Force-bearing block; 26—First connecting shaft; 27—Transmission block; 28—Third connecting shaft; 29—First force-bearing block; 30—Second limiting slot; 31—Limiting sleeve; 32—Pull rope; 33—Sixth force-bearing block; 34—Valve; 35—Second force-bearing block; 36—Extension spring; 37—Paddle; 38—Third force-bearing rod; 39—Seventh connecting shaft; 40—Mounting slot; 41—First limiting slot; 42—Nut.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The technical solution of the present disclosure are further described below in conjunction with the accompanying drawings and embodiments.

Embodiments

As shown in FIGS. 1, 2, 5, 6 and 7, a seat lumbar adjustment device includes:

• • a first force-bearing plate 13;
  • two first force-bearing rods 22, one end of each of the two first force-bearing rods 22 being hinged to the first force-bearing plate 13;
  • a second force-bearing plate 18, wherein the second force-bearing plate 18 is opposite the first force-bearing plate 13, and the other end of each of the two first force-bearing rods 22 are slidably and rotatably connected to the second force-bearing plate 18;
  • two second force-bearing rods 15, wherein one end of each of the two second force-bearing rods 15 is hinged to the second force-bearing plate 18, and the other end of each of the two second force-bearing rods 15 is slidably and rotatably connected to the first force-bearing plate 13;
  • two first force-bearing blocks 29, which are correspondingly and rotatably provided at the ends of the two first force-bearing rods 22 close to the first force-bearing plate 13;
  • a first connecting shaft 26, which is rotatably provided between the two first force-bearing blocks 29 and is rotatably connected to the ends of the two second force-bearing rods 15 close to the first force-bearing plate 13;
  • a second force-bearing block 35, which is fixedly provided at one end of the first force-bearing plate 13;
  • a gas strut 24, one end of the gas strut 24 being rotatably connected to the first connecting shaft 26, and the other end of the gas strut 24 being fixedly connected to the second force-bearing block 35; and
  • a sixth connecting shaft 14, which is rotatably connected to the first force-bearing rod 22 and the second force-bearing rod 15 on the same side.

The first force-bearing plate 13 is U-shaped. First limiting slots 41 are symmetrically provided on and extend through two side surfaces of the first force-bearing plate 13. The first connecting shaft 26 passes through the two first limiting slots 41 and is configured to reciprocate along the length direction of the first limiting slots 41.

The adjustment device is fixed in a certain position, so that one end of the first force-bearing plate 13 is fixed to the backrest of a seat, and one end of the second force-bearing plate 18 is fixed to a lumbar support block. When it is necessary to adjust the lumbar support block to enable the lumbar support block to conform to a user's lower back, the gas strut 24 is activated. The length of the gas strut 24 can be adjusted to push the lumbar support block to move. The lumbar support block drives the second force-bearing plate 18 to move toward the first force-bearing plate 13. The second force-bearing plate 18 drives the second force-bearing rods 15 and the first force-bearing rods 22 to rotate around the sixth connecting shaft 14. The ends of the second force-bearing rods 15 close to the first force-bearing plate 13 slide and rotate, while the ends of the first force-bearing rods 22 close to the second force-bearing plate 18 slide and rotate.

The seat lumbar adjustment device further includes two transmission blocks 27. The first connecting shaft 26 and a third connecting shaft 28 are rotatably provided between the two transmission blocks 27, and the two transmission blocks 27 are attached to both sides of the first force-bearing plate 13.

When it is necessary to move the first force-bearing plate 13 and the second force-bearing plate 18 away from each other, the gas strut 24 is activated. The gas strut 24 extends and drives the first connecting shaft 26 to move. The first connecting shaft 26 drives the ends of the second force-bearing rods 15 close to the first force-bearing plate 13 to move. Meanwhile, under the pushing force of the gas strut 24, the second force-bearing rods 15 rotate around the sixth connecting shaft 14. The rotation of the second force-bearing rods 15 drive the second force-bearing plate 18 to slide away from the first force-bearing plate 13. The movement of the second force-bearing plate 18 drives the first force-bearing rods 22 to rotate around the sixth connecting shaft 14, while the ends of the first force-bearing rods 22 close to the second force-bearing plate 18 slide.

By means of the driving of the gas strut 24, the first force-bearing rods 22 and the second force-bearing rods 15 cooperate with each other, thereby driving the first force-bearing plate 13 and the second force-bearing plate 18 to move toward or away from each other. This in turn drives the lumbar support block to move, thereby ensuring the lumbar support block conforms to a user's lower back.

As shown in FIGS. 1 and 2, two third force-bearing blocks 16 are fixedly provided on the end of the second force-bearing plate 18 close to the first force-bearing plate 13. A second connecting shaft 17 is rotatably provided on each of the third force-bearing blocks 16, and the second force-bearing rods 15 are fixedly connected to the corresponding second connecting shafts 17. Second limiting slots 30 are symmetrically provided on and extend through two side surfaces of the first force-bearing plate 13. A third connecting shaft 28 is fixedly provided at the other end of each of the second force-bearing rods 15. The third connecting shaft 28 is slidably provided in the corresponding second limiting slot 30. A fourth connecting shaft 12 is fixedly provided at the end of each of the two first force-bearing rods 22 close to the first force-bearing plate 13, and each of the fourth connecting shafts 12 is rotatably connected to the first force-bearing plate 13. Two symmetrical fourth force-bearing blocks 20 are fixedly provided at the end of the second force-bearing plate 18 close to the first force-bearing plate 13, and a third limiting slot 21 is provided on and extends through each of the fourth force-bearing blocks 20. A fifth connecting shaft 19 is fixedly provided at the end of each of the first force-bearing rods 22 close to the second force-bearing plate 18. The fifth connecting shaft 19 is slidably provided in the third limiting slot 21. With this connection method, when the ends of the second force-bearing rods 15 close to the first force-bearing plate 13 are pushed horizontally, the second force-bearing rods 15 cooperate with the first force-bearing rods 22 to enable the second force-bearing plate 18 and the first force-bearing plate 13 to move toward or away from each other.

As shown in FIG. 1, a connecting plate 23 is fixedly provided between the two second force-bearing rods 15, and the connecting plate 23 serves to stabilize the two second force-bearing rods 15.

As shown in FIG. 1, a fifth force-bearing block 25 is fixedly provided at a fixed end of the gas strut 24. The fifth force-bearing block 25 is fixed to the first connecting shaft 26. A telescopic end of the gas strut 24 is provided with threads and is threadedly connected to a nut 42 that abuts against the second force-bearing block 35. The end of the telescopic end of the gas strut 24 passing through the second force-bearing block 35 is threadedly connected to a sixth force-bearing block 33. A valve 34 is provided on the telescopic end of the gas strut 24. A mounting slot 40 is provided on and extend through the first force-bearing plate 13. During assembly, a portion of the gas strut 24 extends into the mounting slot 40. By pressing the valve 34, the gas strut 24 automatically extends when no external force is applied, and retracts when external force is applied.

As shown in FIGS. 1 and 3, a seventh connecting shaft 39 is fixedly provided on the sixth force-bearing block 33. A paddle 37 is rotatably provided on the seventh connecting shaft 39. A third force-bearing rod 38 passes through the other end of the paddle 37, and a pull rope 32 is fixedly provided on the third force-bearing rod 38. When the pull rope 32 is pulled, it drives the paddle 37 to rotate around the seventh connecting shaft 39 by means of the third force-bearing rod 38, and the rotating paddle 37 presses the valve 34. The length of the gas strut 24 can be adjusted, and thus the distance between the first force-bearing plate 13 and the second force-bearing plate 18 can be adjusted. The extension and retraction of the gas strut 24 is controlled by means of the valve 34, which is a conventional technique and therefore not described in detail in the description.

As shown in FIG. 1, a limiting sleeve 31 is threadedly and rotatably connected to the sixth force-bearing block 33. The pull rope 32 passes through the limiting sleeve 31. An extension spring 36 is connected between the paddle 37 and the sixth force-bearing block 33. The pull rope 32 passes through the extension spring 36. When the pull rope 32 is released, the extension spring 36 pushes the paddle 37 to rotate, causing the paddle 37 to no longer press against the valve 34.

As shown in FIG. 1, two seventh force-bearing blocks 11 are fixedly provided on the first force-bearing plate 13, and a force-bearing spring 10 is provided between each of the seventh force-bearing blocks 11 and the first connecting shaft 26. With this structure, when the valve 34 is pressed, the force-bearing spring 10 can effectively drive the first connecting shaft 26 to move toward the fourth connecting shaft 12.

The working principle is as follows.

When it is necessary to adjust the position of the lumbar support block, the pull rope 32 is pulled, which drives the paddle 37 to rotate around the seventh connecting shaft 39 by means of the third force-bearing rod 38. The paddle 37 then presses the valve 34, and at this time, the gas strut 24 is in an adjustable state. The second force-bearing plate 18 is pressed to move toward the first force-bearing plate 13. The second force-bearing plate 18 drives the second force-bearing rods 15 to rotate around the sixth connecting shaft 14 by means of the second connecting shaft 17. Then the second force-bearing rods 15 drive the third connecting shaft 28 to move towards the second force-bearing block 35 along the second limiting slot 30. The third connecting shaft 28 drives the first connecting shaft 26 to move by means of the transmission blocks 27. The first connecting shaft 26 drives the gas strut 24 to retract. The second force-bearing plate 18 drives the fifth connecting shaft 19 to move by means of the fourth force-bearing blocks 20. The fifth connecting shaft 19 drives the first force-bearing rods 22 to rotate around the sixth connecting shaft 14, and the fifth connecting shaft 19 moves within the third limiting slot 21. After the adjustment is completed, the pull rope 32 is released, and the extension spring 36 then drives the paddle 37 to rotate. Upon rotation of the paddle 37, it no longer presses the valve 34.

The pull rope 32 is pulled, which drives the paddle 37 to rotate around the seventh connecting shaft 39 by means of the third force-bearing rod 38. The paddle 37 then presses the valve 34, and at this time, the gas strut 24 is in an adjustable state. The gas strut 24 extends under its own force and pushes the first connecting shaft 26 to move by means of the fifth force-bearing block 25. The first connecting shaft 26 drives the third connecting shaft 28 to move by means of the transmission block 27. The movement of the third connecting shaft 28 causes the second force-bearing rod 15 to rotate around the sixth connecting shaft 14. The second force-bearing rods 15 drive the third force-bearing blocks 16 to move by means of the second connecting shaft 17. The third force-bearing blocks 16 drive the second force-bearing plate 18 to move away from the first force-bearing plate 13. The second force-bearing plate 18 drives the fifth connecting shaft 19 to move by means of the fourth force-bearing blocks 20. The fifth connecting shaft 19 drives the first force-bearing rods 22 to rotate around the sixth connecting shaft 14.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure and are not intended to limit the present disclosure. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutes can be made to the technical solution of the present disclosure without departing from the spirit and scope of the technical solution of the present disclosure. All such modifications and substitutes shall fall within the scope of the claims of the present disclosure.